diff options
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/Makefile | 4 | ||||
| -rw-r--r-- | firmware/libs-device/Readme.txt | 22 | ||||
| -rw-r--r-- | firmware/libs-device/osccal.c | 183 | ||||
| -rw-r--r-- | firmware/libs-device/osctune.h | 88 | ||||
| -rw-r--r-- | firmware/osccal.h (renamed from firmware/libs-device/osccal.h) | 0 | ||||
| -rw-r--r-- | firmware/osccalASM.S (renamed from firmware/libs-device/osccalASM.S) | 0 | ||||
| -rw-r--r-- | firmware/osccalASM.o | bin | 0 -> 1684 bytes |
7 files changed, 2 insertions, 295 deletions
diff --git a/firmware/Makefile b/firmware/Makefile index 0905d0a..9da5be6 100644 --- a/firmware/Makefile +++ b/firmware/Makefile @@ -149,12 +149,12 @@ CC = avr-gcc DEFINES = -DBOOTLOADER_ADDRESS=0x$(BOOTLOADER_ADDRESS) #-DDEBUG_LEVEL=2 # Remove the -fno-* options when you use gcc 3, it does not understand them # -CFLAGS = -g2 -nostartfiles -ffunction-sections -fdata-sections -fpack-struct -Wall -Os -fno-inline-small-functions -fno-move-loop-invariants -fno-tree-scev-cprop -I. -Ilibs-device -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) $(DEFINES) +CFLAGS = -g2 -nostartfiles -ffunction-sections -fdata-sections -fpack-struct -Wall -Os -fno-inline-small-functions -fno-move-loop-invariants -fno-tree-scev-cprop -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) $(DEFINES) LDFLAGS = -Wl,--relax,--section-start=.text=$(BOOTLOADER_ADDRESS),-Map=main.map,--section-start=.zerotable=0 OBJECTS = crt1.o usbdrv/usbdrvasm.o usbdrv/oddebug.o main.o -OBJECTS += libs-device/osccalASM.o +OBJECTS += osccalASM.o # symbolic targets: all: main.hex diff --git a/firmware/libs-device/Readme.txt b/firmware/libs-device/Readme.txt deleted file mode 100644 index 76518dc..0000000 --- a/firmware/libs-device/Readme.txt +++ /dev/null @@ -1,22 +0,0 @@ -This is the Readme file for the libs-device directory. This directory contains -code snippets which may be useful for USB device firmware. - - -WHAT IS INCLUDED IN THIS DIRECTORY? -=================================== - -osccal.c and osccal.h - This module contains a function which calibrates the AVR's built-in RC - oscillator based on the USB frame clock. See osccal.h for a documentation - of the API. - -osctune.h - This header file contains a code snippet for usbconfig.h. With this code, - you can keep the AVR's internal RC oscillator in sync with the USB frame - clock. This is a continuous synchronization, not a single calibration at - USB reset as with osccal.c above. Please note that this code works only - if D- is wired to the interrupt, not D+. - ----------------------------------------------------------------------------- -(c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH. -http://www.obdev.at/ diff --git a/firmware/libs-device/osccal.c b/firmware/libs-device/osccal.c deleted file mode 100644 index 8debe49..0000000 --- a/firmware/libs-device/osccal.c +++ /dev/null @@ -1,183 +0,0 @@ -/* Name: osccal.c - * Author: Christian Starkjohann - * Creation Date: 2008-04-10 - * Tabsize: 4 - * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH - * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) - * This Revision: $Id: osccal.c 762 2009-08-12 17:10:30Z cs $ - */ - -#include <avr/io.h> -#include <avr/interrupt.h> -#ifndef uchar -#define uchar unsigned char -#endif - -int usbMeasureFrameLengthDecreasing(int); - -/* ------------------------------------------------------------------------- */ -/* ------------------------ Oscillator Calibration ------------------------- */ -/* ------------------------------------------------------------------------- */ - -/* Calibrate the RC oscillator. Our timing reference is the Start Of Frame - * signal (a single SE0 bit) repeating every millisecond immediately after - * a USB RESET. - * - * - * Optimized version by cpldcpu@gmail.com, Nov 3rd 2013. - * - * Benefits: - * - Codesize reduced by 54 bytes. - * - Improved robustness due to removing timeout from frame length measurement and - * inserted NOP after OSCCAL writes. - * - * Changes: - * - The new routine performs a combined binary and neighborhood search - * in a single loop. - * Note that the neighborhood search is necessary due to the quasi-monotonic - * nature of OSCCAL. (See Atmel application note AVR054). - * - Inserted NOP after writes to OSCCAL to avoid CPU errors during oscillator - * stabilization. - * - Implemented new routine to measure frame time "usbMeasureFrameLengthDecreasing". - * This routine takes the target time as a parameter and returns the deviation. - * - usbMeasureFrameLengthDecreasing measures in multiples of 5 cycles and is thus - * slighly more accurate. - * - usbMeasureFrameLengthDecreasing does not support time out anymore. The original - * implementation returned zero in case of time out, which would have caused the old - * calibrateOscillator() implementation to increase OSSCAL to 255, effictively - * overclocking and most likely crashing the CPU. The new implementation will enter - * an infinite loop when no USB activity is encountered. The user program should - * use the watchdog to escape from situations like this. - * - * This routine will work both on controllers with and without split OSCCAL range. - * The first trial value is 128 which is the lowest value of the upper OSCCAL range - * on Attiny85 and will effectively limit the search to the upper range, unless the - * RC oscillator frequency is unusually high. Under normal operation, the highest - * tested frequency setting is 192. This corresponds to ~20 Mhz core frequency and - * is still within spec for a 5V device. - */ - -void calibrateOscillator(void) -{ - uchar step, trialValue, optimumValue; - int x, targetValue; - uchar optimumDev; - uchar i,xl; - - targetValue = (unsigned)((double)F_CPU * 999e-6 / 5.0 + 0.5); /* Time is measured in multiples of 5 cycles. Target is 0.999µs */ - optimumDev = 0xff; - // optimumValue = OSCCAL; - step=64; - trialValue = 128; - - cli(); // disable interrupts - - /* - Performs seven iterations of a binary search (stepwidth decreasing9 - with three additional steps of a neighborhood search (step=1, trialvalue will oscillate around target value to find optimum) - */ - - for(i=0; i<10; i++){ - OSCCAL = trialValue; - asm volatile(" NOP"); - - x = usbMeasureFrameLengthDecreasing(targetValue); - - if(x < 0) /* frequency too high */ - { - trialValue -= step; - xl=(uchar)-x; - } - else /* frequency too low */ - { - trialValue += step; - xl=(uchar)x; - } - - /* - Halve stepwidth to perform binary search. Logical oring with 1 to ensure step is never equal to zero. - This results in a neighborhood search with stepwidth 1 after binary search is finished. - Once the neighbourhood search stage is reached, x will be smaller than +-255, hence more code can be - saved by only working with the lower 8 bits. - */ - - step >>= 1; - - if (step==0) - { - step=1; - if(xl <= optimumDev){ - optimumDev = xl; - optimumValue = OSCCAL; - } - } - - } - - OSCCAL = optimumValue; - asm volatile(" NOP"); - - sei(); // enable interrupts -} - -void calibrateOscillator_old(void) -{ - uchar step, trialValue, optimumValue; - int x, optimumDev, targetValue; - uchar i; - - targetValue = (unsigned)((double)F_CPU * 999e-6 / 5.0 + 0.5); /* Time is measured in multiples of 5 cycles. Target is 0.999µs */ - optimumDev = 0x7f00; // set to high positive value - optimumValue = OSCCAL; - step=64; - trialValue = 128; - - /* - Performs seven iterations of a binary search (stepwidth decreasing9 - with three additional steps of a neighborhood search (step=1, trialvalue will oscillate around target value to find optimum) - */ - - for(i=0; i<10; i++){ - OSCCAL = trialValue; - asm volatile(" NOP"); - - x = usbMeasureFrameLengthDecreasing(targetValue); - - if(x < 0) /* frequency too high */ - { - trialValue -= step; - x = -x; - } - else /* frequency too low */ - { - trialValue += step; - } - - /* - Halve stepwidth to perform binary search. Logical oring with 1 to ensure step is never equal to zero. - This results in a neighborhood search with stepwidth 1 after binary search is finished. - */ - - step >>= 1; - step |=1; - - if(x < optimumDev){ - optimumDev = x; - optimumValue = OSCCAL; - } - } - - OSCCAL = optimumValue; - asm volatile(" NOP"); -} - -/* -Note: This calibration algorithm may try OSCCAL values of up to 192 even if -the optimum value is far below 192. It may therefore exceed the allowed clock -frequency of the CPU in low voltage designs! -You may replace this search algorithm with any other algorithm you like if -you have additional constraints such as a maximum CPU clock. -For version 5.x RC oscillators (those with a split range of 2x128 steps, e.g. -ATTiny25, ATTiny45, ATTiny85), it may be useful to search for the optimum in -both regions. -*/ diff --git a/firmware/libs-device/osctune.h b/firmware/libs-device/osctune.h deleted file mode 100644 index c751648..0000000 --- a/firmware/libs-device/osctune.h +++ /dev/null @@ -1,88 +0,0 @@ -/* Name: osctune.h - * Author: Christian Starkjohann - * Creation Date: 2008-10-18 - * Tabsize: 4 - * Copyright: (c) 2008 by OBJECTIVE DEVELOPMENT Software GmbH - * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) - * This Revision: $Id: osctune.h 692 2008-11-07 15:07:40Z cs $ - */ - -/* -General Description: -This file is declared as C-header file although it is mostly documentation -how the RC oscillator can be kept in sync to the USB frame rate. The code -shown here must be added to usbconfig.h or this header file is included from -there. This code works only if D- is wired to the interrupt, not D+!!! - -This is an alternative to the osccal routine in osccal.c. It has the advantage -that the synchronization is done continuously and that it has more compact -code size. The disadvantages are slow synchronization (it may take a while -until the driver works), that messages immediately after the SOF pulse may be -lost (and need to be retried by the host) and that the interrupt is on D- -contrary to most examples. - -You may want to store a good calibration value in EEPROM for the next startup. -You know that the calibration value is good when the first USB message is -received. Do not store the value on every received message because the EEPROM -has a limited endurance. - -Notes: -(*) You must declare the global character variable "lastTimer0Value" in your -main code. - -(*) Timer 0 must be free running (not written by your code) and the prescaling -must be consistent with the TIMER0_PRESCALING define. - -(*) Good values for Timer 0 prescaling depend on how precise the clock must -be tuned and how far away from the default clock rate the target clock is. -For precise tuning, choose a low prescaler factor, for a broad range of tuning -choose a high one. A prescaler factor of 64 is good for the entire OSCCAL -range and allows a precision of better than +/-1%. A prescaler factor of 8 -allows tuning to slightly more than +/-6% of the default frequency and is -more precise than one step of OSCCAL. It is therefore not suitable to tune an -8 MHz oscillator to 12.5 MHz. - -Thanks to Henrik Haftmann for the idea to this routine! -*/ - -#define TIMER0_PRESCALING 64 /* must match the configuration for TIMER0 in main */ -#define TOLERATED_DEVIATION_PPT 5 /* max clock deviation before we tune in 1/10 % */ -/* derived constants: */ -#define EXPECTED_TIMER0_INCREMENT ((F_CPU / (1000 * TIMER0_PRESCALING)) & 0xff) -#define TOLERATED_DEVIATION (TOLERATED_DEVIATION_PPT * F_CPU / (1000000 * TIMER0_PRESCALING)) - -#ifdef __ASSEMBLER__ -macro tuneOsccal - push YH ;[0] - in YL, TCNT0 ;[2] - lds YH, lastTimer0Value ;[3] - sts lastTimer0Value, YL ;[5] - sub YL, YH ;[7] time passed since last frame - subi YL, EXPECTED_TIMER0_INCREMENT ;[8] -#if OSCCAL > 0x3f /* outside I/O addressable range */ - lds YH, OSCCAL ;[6] -#else - in YH, OSCCAL ;[6] assembler modle uses __SFR_OFFSET == 0 -#endif - cpi YL, TOLERATED_DEVIATION + 1 ;[10] - brmi notTooHigh ;[11] - subi YH, 1 ;[12] clock rate was too high -; brcs tuningOverflow ; optionally check for overflow - rjmp osctuneDone ;[13] -notTooHigh: - cpi YL, -TOLERATED_DEVIATION ;[13] - brpl osctuneDone ;[14] not too low - inc YH ;[15] clock rate was too low -; breq tuningOverflow ; optionally check for overflow -osctuneDone: -#if OSCCAL > 0x3f /* outside I/O addressable range */ - sts OSCCAL, YH ;[12-13] store tuned value -#else - out OSCCAL, YH ;[12-13] store tuned value -#endif -tuningOverflow: - pop YH ;[17] - endm ;[19] max number of cycles -#endif - -#define USB_SOF_HOOK tuneOsccal diff --git a/firmware/libs-device/osccal.h b/firmware/osccal.h index af37a43..af37a43 100644 --- a/firmware/libs-device/osccal.h +++ b/firmware/osccal.h diff --git a/firmware/libs-device/osccalASM.S b/firmware/osccalASM.S index 9a317f1..9a317f1 100644 --- a/firmware/libs-device/osccalASM.S +++ b/firmware/osccalASM.S diff --git a/firmware/osccalASM.o b/firmware/osccalASM.o Binary files differnew file mode 100644 index 0000000..2a829d4 --- /dev/null +++ b/firmware/osccalASM.o |